Blueberry Crumb Blondies with a Lemon Glaze

If you love blueberry coffee cake and chewy blondies, this recipe brings the best of both worlds together. These Blueberry Crumb Blondies are rich, buttery, and packed with juicy blueberries, then finished with a sweet cinnamon crumb topping and an optional fresh lemon glaze that adds the perfect bright finish.

Every bite is soft and chewy with bursts of blueberries and a buttery crumble that bakes into a lightly crisp topping. They're simple enough for a weekend baking project yet impressive enough to serve at brunch, baby showers, spring gatherings, or alongside your afternoon coffee.

Whether you enjoy them warm from the oven or chilled the next day, these blondies are guaranteed to become a favorite.

Why You'll Love This Recipe

• Soft, buttery blondies with a perfectly chewy texture.

• Packed with juicy blueberries in every bite.

• Buttery cinnamon crumb topping adds irresistible crunch.

• Fresh lemon glaze brightens every flavor.

• Easy one-bowl blondie batter.

• Perfect for spring and summer baking.

• Great for brunch, dessert, or an afternoon treat.

Ingredient Notes

You only need a handful of pantry staples plus a few fresh ingredients to make these delicious blondies.

Unsalted Butter

Using melted butter gives these blondies their rich flavor and chewy texture.

Brown Sugar

Brown sugar adds moisture, sweetness, and subtle caramel notes that pair beautifully with blueberries.

Eggs

Room temperature eggs blend more smoothly into the batter and help create an even texture.

Vanilla Extract

Adds warmth and enhances the sweetness of the blueberries.

Frozen Blueberries

Frozen blueberries work beautifully because they hold their shape while baking. There's no need to thaw them first.

All-Purpose Flour

Provides just enough structure while keeping the blondies soft.

Baking Powder

A small amount gives the blondies a gentle lift.

Cinnamon Crumb Topping

Made with butter, flour, sugar, cinnamon, lemon zest, and salt for a bakery-style finish.

Lemon Glaze (Optional)

Fresh lemon zest and juice create a bright, tangy glaze that perfectly complements the sweet blueberries.

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Tips for Perfect Blueberry Blondies

Don't Thaw the Blueberries

Using frozen blueberries straight from the freezer helps prevent excess moisture and keeps the batter from turning purple.

Mix the Batter Gently

Once the flour is added, gently fold the batter together until just combined. Overmixing can create dense blondies instead of soft, chewy ones.

Make the Crumb Topping First

Preparing the crumb topping before the batter allows it to firm up slightly while you mix everything else, creating larger, more defined crumbs during baking.

Wait Before Adding the Lemon Glaze

Allow the blondies to cool completely before drizzling on the glaze. If they're still warm, the glaze will melt into the bars instead of sitting beautifully on top.

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Storage

Store the blondies in an airtight container at room temperature for up to 3 days.

If topped with the lemon glaze, they're best refrigerated after the first day and will stay fresh for up to 5 days.